a = Canvas()

d = FM('bass').note.seq( [0,7], 1/8 )

e = Follow( d, 4096 )

//when mapping 2D you need to use the draw loop and grab instantaneous values
a.draw = function() {
  a.clear()
  var size = 500
  var size2 = e.getValue() * 2500 //use amplitude follower to get instantaneous amp
  //var size2 = d.frequency //or grab instantaneous frequency
  a.rectangle( 0,400, size, size2).fill('red')
}

//when mapping to 3D you can simply capitalize properties to create continuous mappings
mysine = Sine(); 
mycube = Cube();
mycube.scale = mysine.Frequency
mysine.frequency.seq( [220,440,880,1760], 1/4 )

dots = Dots()
dots.scale = Mouse.X